Java generates a random array of 6 digits

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Package com. system. oss. common. util; /** * Dynamically generate random character arrays  *  * @ Author Su Zhiheng */ Public class implements messagecodeuntil { /** * Randomly generate an array of 4 digit characters      *  * @ Return rands */ Public static char [] generateCheckCode ()     { String chars = "0123456789 "; Char [] rands = new char [4]; For (int I = 0; I <4; I ++)         { Int rand = (int) (Math. random () * 10 ); Rands [I] = chars. charAt (rand );         } Return rands;     } /** * Randomly generate a 6-digit array      *  * @ Return rands */ Public static char [] generateCheckPass ()     { String chars = "0123456789 "; Char [] rands = new char [6]; For (int I = 0; I <6; I ++)         { Int rand = (int) (Math. random () * 10 ); Rands [I] = chars. charAt (rand );         } Return rands;     } }